User-Agent: *
Allow: /
Disallow: /tags
Disallow: /login
Disallow: /logout
Disallow: /badges
Disallow: /awards
Disallow: /create
Disallow: /search
Disallow: /feeds
Disallow: /members
Disallow: /signup
Disallow: /api
Disallow: /revisions

#
# http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=40360
# To block access to all URLs that include a question mark (?) (more specifically, any URL that begins 
# with your domain name, followed by any string, followed by a question mark, followed by any string): 
#
User-agent: Googlebot
Disallow: /*?

User-agent: Slurp
Disallow: *
Crawl-delay: 1

User-agent: msnbot
Crawl-delay: 1

Sitemap: /external-matters/xml_sitemap.php